Struct FallbackRenderer 

pub struct FallbackRenderer { /* private fields */ }

Composite renderer that tries multiple backends in order.

Implementations

impl FallbackRenderer

pub fn new( config: &RendererConfig, user_agent: &str, proxy: Option<&str>, stealth: &StealthConfig, ) -> CrwResult<Self>

pub async fn shutdown_chrome_pool(&self, _drain: Duration)

No-op when the cdp feature is disabled — keeps caller code simple.

pub fn with_host_limits( self, requests_per_second: f64, per_host_max_concurrent: u32, ) -> Self

Configure the process-wide per-host limiter (eTLD+1 keyed). Call once at startup with values from CrawlerConfig. Defaults: rps=0.0 (no interval floor), per-host cap=1 (strict politeness).

pub fn preferences(&self) -> Arc<HostPreferences>

Access the host preferences cache (for admin endpoints, tests).

pub fn breakers(&self) -> Arc<BreakerRegistry>

Access the breaker registry (for tests).

pub fn js_renderer_names(&self) -> Vec<&str>

Names of the configured JS renderers in fallback order. Used for startup logs and tests — does not leak internal types.

pub async fn fetch( &self, url: &str, headers: &HashMap<String, String>, render_js: Option<bool>, wait_for_ms: Option<u64>, requested_renderer: Option<&str>, deadline: Deadline, ) -> CrwResult<FetchResult>

Fetch a URL with smart mode: HTTP first, then JS if needed.

When render_js is None (auto-detect), the renderer also escalates to JS rendering if the HTTP response looks like an anti-bot challenge page (Cloudflare “Just a moment…”, etc.). The CDP renderer has built-in challenge retry logic that waits for non-interactive JS challenges to auto-resolve.

pub async fn check_health(&self) -> HashMap<String, bool>

Check availability of all renderers.

Trait Implementations

impl Debug for FallbackRenderer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.